int session_cipher_encrypt(session_cipher *cipher,
const uint8_t *padded_message, size_t padded_message_len,
ciphertext_message **encrypted_message)
{
int result = 0;
session_record *record = 0;
session_state *state = 0;
ratchet_chain_key *chain_key = 0;
ratchet_chain_key *next_chain_key = 0;
ratchet_message_keys message_keys;
ec_public_key *sender_ephemeral = 0;
uint32_t previous_counter = 0;
uint32_t session_version = 0;
signal_buffer *ciphertext = 0;
uint32_t chain_key_index = 0;
ec_public_key *local_identity_key = 0;
ec_public_key *remote_identity_key = 0;
signal_message *message = 0;
pre_key_signal_message *pre_key_message = 0;
uint8_t *ciphertext_data = 0;
size_t ciphertext_len = 0;
assert(cipher);
signal_lock(cipher->global_context);
if(cipher->inside_callback == 1) {
result = SG_ERR_INVAL;
goto complete;
}
result = signal_protocol_session_load_session(cipher->store, &record, cipher->remote_address);
if(result < 0) {
goto complete;
}
state = session_record_get_state(record);
if(!state) {
result = SG_ERR_UNKNOWN;
goto complete;
}
chain_key = session_state_get_sender_chain_key(state);
if(!chain_key) {
result = SG_ERR_UNKNOWN;
goto complete;
}
result = ratchet_chain_key_get_message_keys(chain_key, &message_keys);
if(result < 0) {
goto complete;
}
sender_ephemeral = session_state_get_sender_ratchet_key(state);
if(!sender_ephemeral) {
result = SG_ERR_UNKNOWN;
goto complete;
}
previous_counter = session_state_get_previous_counter(state);
session_version = session_state_get_session_version(state);
result = session_cipher_get_ciphertext(cipher,
&ciphertext,
session_version, &message_keys,
padded_message, padded_message_len);
if(result < 0) {
goto complete;
}
ciphertext_data = signal_buffer_data(ciphertext);
ciphertext_len = signal_buffer_len(ciphertext);
chain_key_index = ratchet_chain_key_get_index(chain_key);
local_identity_key = session_state_get_local_identity_key(state);
if(!local_identity_key) {
result = SG_ERR_UNKNOWN;
goto complete;
}
remote_identity_key = session_state_get_remote_identity_key(state);
if(!remote_identity_key) {
result = SG_ERR_UNKNOWN;
goto complete;
}
result = signal_message_create(&message,
session_version,
message_keys.mac_key, sizeof(message_keys.mac_key),
sender_ephemeral,
chain_key_index, previous_counter,
ciphertext_data, ciphertext_len,
local_identity_key, remote_identity_key,
cipher->global_context);
if(result < 0) {
goto complete;
}
if(session_state_has_unacknowledged_pre_key_message(state) == 1) {
uint32_t local_registration_id = session_state_get_local_registration_id(state);
int has_pre_key_id = 0;
uint32_t pre_key_id = 0;
uint32_t signed_pre_key_id;
ec_public_key *base_key;
if(session_state_unacknowledged_pre_key_message_has_pre_key_id(state)) {
has_pre_key_id = 1;
pre_key_id = session_state_unacknowledged_pre_key_message_get_pre_key_id(state);
}
signed_pre_key_id = session_state_unacknowledged_pre_key_message_get_signed_pre_key_id(state);
base_key = session_state_unacknowledged_pre_key_message_get_base_key(state);
if(!base_key) {
result = SG_ERR_UNKNOWN;
goto complete;
}
result = pre_key_signal_message_create(&pre_key_message,
session_version, local_registration_id, (has_pre_key_id ? &pre_key_id : 0),
signed_pre_key_id, base_key, local_identity_key,
message,
cipher->global_context);
if(result < 0) {
goto complete;
}
SIGNAL_UNREF(message);
message = 0;
}
result = ratchet_chain_key_create_next(chain_key, &next_chain_key);
if(result < 0) {
goto complete;
}
result = session_state_set_sender_chain_key(state, next_chain_key);
if(result < 0) {
goto complete;
}
result = signal_protocol_session_store_session(cipher->store, cipher->remote_address, record);
complete:
if(result >= 0) {
if(pre_key_message) {
*encrypted_message = (ciphertext_message *)pre_key_message;
}
else {
*encrypted_message = (ciphertext_message *)message;
}
}
else {
SIGNAL_UNREF(pre_key_message);
SIGNAL_UNREF(message);
}
signal_buffer_free(ciphertext);
SIGNAL_UNREF(next_chain_key);
SIGNAL_UNREF(record);
signal_explicit_bzero(&message_keys, sizeof(ratchet_message_keys));
signal_unlock(cipher->global_context);
return result;
}
END_TEST
START_TEST(test_serialize_pre_key_signal_message)
{
int result = 0;
static const char ciphertext[] = "WhisperCipherText";
ec_public_key *sender_ratchet_key = create_test_ec_public_key(global_context);
ec_public_key *sender_identity_key = create_test_ec_public_key(global_context);
ec_public_key *receiver_identity_key = create_test_ec_public_key(global_context);
ec_public_key *base_key = create_test_ec_public_key(global_context);
ec_public_key *identity_key = create_test_ec_public_key(global_context);
uint8_t mac_key[RATCHET_MAC_KEY_LENGTH];
memset(mac_key, 1, sizeof(mac_key));
signal_message *message = 0;
pre_key_signal_message *pre_key_message = 0;
pre_key_signal_message *result_pre_key_message = 0;
result = signal_message_create(&message, 3,
mac_key, sizeof(mac_key),
sender_ratchet_key,
2, /* counter */
1, /* previous counter */
(uint8_t *)ciphertext, sizeof(ciphertext) - 1,
sender_identity_key, receiver_identity_key,
global_context);
ck_assert_int_eq(result, 0);
uint32_t pre_key_id = 56;
result = pre_key_signal_message_create(&pre_key_message,
3, /* message version */
42, /* registration ID */
&pre_key_id, /* pre key ID */
72, /* signed pre key ID */
base_key, identity_key,
message,
global_context);
ck_assert_int_eq(result, 0);
signal_buffer *serialized = ciphertext_message_get_serialized((ciphertext_message *)pre_key_message);
ck_assert_ptr_ne(serialized, 0);
result = pre_key_signal_message_deserialize(&result_pre_key_message,
signal_buffer_data(serialized),
signal_buffer_len(serialized),
global_context);
ck_assert_int_eq(result, 0);
int version1 = pre_key_signal_message_get_message_version(pre_key_message);
int version2 = pre_key_signal_message_get_message_version(result_pre_key_message);
ck_assert_int_eq(version1, version2);
ec_public_key *identity_key1 = pre_key_signal_message_get_identity_key(pre_key_message);
ec_public_key *identity_key2 = pre_key_signal_message_get_identity_key(result_pre_key_message);
ck_assert_int_eq(ec_public_key_compare(identity_key1, identity_key2), 0);
int registration_id1 = pre_key_signal_message_get_registration_id(pre_key_message);
int registration_id2 = pre_key_signal_message_get_registration_id(result_pre_key_message);
ck_assert_int_eq(registration_id1, registration_id2);
int has_pre_key_id1 = pre_key_signal_message_has_pre_key_id(pre_key_message);
int has_pre_key_id2 = pre_key_signal_message_has_pre_key_id(result_pre_key_message);
ck_assert_int_eq(has_pre_key_id1, has_pre_key_id2);
if(has_pre_key_id1) {
int pre_key_id1 = pre_key_signal_message_get_pre_key_id(pre_key_message);
int pre_key_id2 = pre_key_signal_message_get_pre_key_id(result_pre_key_message);
ck_assert_int_eq(pre_key_id1, pre_key_id2);
}
int signed_pre_key_id1 = pre_key_signal_message_get_signed_pre_key_id(pre_key_message);
int signed_pre_key_id2 = pre_key_signal_message_get_signed_pre_key_id(result_pre_key_message);
ck_assert_int_eq(signed_pre_key_id1, signed_pre_key_id2);
ec_public_key *base_key1 = pre_key_signal_message_get_base_key(pre_key_message);
ec_public_key *base_key2 = pre_key_signal_message_get_base_key(result_pre_key_message);
ck_assert_int_eq(ec_public_key_compare(base_key1, base_key2), 0);
signal_message *message1 = pre_key_signal_message_get_signal_message(pre_key_message);
signal_message *message2 = pre_key_signal_message_get_signal_message(result_pre_key_message);
compare_signal_messages(message1, message2);
/* Cleanup */
SIGNAL_UNREF(message);
SIGNAL_UNREF(result_pre_key_message);
SIGNAL_UNREF(pre_key_message);
SIGNAL_UNREF(sender_ratchet_key);
SIGNAL_UNREF(sender_identity_key);
SIGNAL_UNREF(receiver_identity_key);
SIGNAL_UNREF(base_key);
SIGNAL_UNREF(identity_key);
}